/Engine/Plugins/2D/Paper2D/Source/Paper2D/Classes/PaperTileMap.h
Returns the polygon for the specified tile (will be 4 or 6 vertices as a rectangle, diamond, or hexagon)
void GetTilePolygon ( int32 TileX, int32 TileY, int32 LayerIndex, [TArray](API\Runtime\Core\Containers\TArray)< FVector > & LocalSpacePoints ) const